It's in Universal Citywalk, which is the boardwalk/shops/nightclub section for Universal Studios, similar to Disney Springs and Downtown Disney.
It's in city walk
Universal Citywalk is the first part of the Universal Orlando property that you pass through if you come in from the parking structures (if you stay on property at hotels like the Hard Rock or Portofino, you bypass the Citywalk area if you go straight to the parks.) Voodoo doughnuts is located on your way to the Universal Studios main gate but still in the Citywalk shopping district.
It's not in the park. You would have to pay for parking during certain hours.
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